Thanks for writing to us.
The medicines provided by your doctor are apt and you should continue with the same till lesions heal. However it seems the lesion might be deep seated and hence its better to get it drained surgically by incision and drainage
. You will have to visit a surgeon nearby. A small incision would be made in the affected area and the whole abscess
would be drained. With in few days after the drainage and continuation of oral antibiotics
the lesion would heal.
Hope that helped